linux-kernel - Re: [PATCH v2 -next 2/2] irqdomain: Replace revmap_direct_max_irq field with hwirq

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Date:   Tue, 19 Jul 2022 13:44:15 +0000
From:   "xuqiang (M)" <xuqiang36@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "weiyongjun (A)" <weiyongjun1@...wei.com>,
        "Guohanjun (Hanjun Guo)" <guohanjun@...wei.com>
Subject: Re: [PATCH v2 -next 2/2] irqdomain: Replace revmap_direct_max_irq
 field with hwirq_max field

在 2022/7/19 18:24, Marc Zyngier 写道:
> On Tue, 19 Jul 2022 07:36:41 +0100,
> Xu Qiang <xuqiang36@...wei.com> wrote:
>> In commit "4f86a06e2d6e irqdomain: Make normal and nomap irqdomains exclusive",
>> use revmap_size field instead of revmap_direct_max_irq. revmap_size field
>> originally indicates the maximum hwirq of linear Mapping. This results in
>> revmap_size having two different layers of meaning that can be confusing.
>>
>> This patch optimization point is to solve this confusion point. During
>> direct mapping, the values of hwirq_max and revmap_direct_max_irq are the same
>> and have the same meanings. They both indicate the maximum hwirq supported by
>> direct Mapping. The optimization method is to delete revmap_direct_max_irq
>> field and use hwirq_max instead of revmap_direct_max_irq.
>>
>> Signed-off-by: Xu Qiang <xuqiang36@...wei.com>
> You keep referencing revmap_direct_max_irq, which is long gone.
>
> How about instead:
>
> <commit>
> NOMAP irq domains use the revmap_size field to indicate the maximum
> hwirq number the domain accepts. This is a bit confusing as
> revmap_size is usually used to indicate the size of the revmap array,
> which a NOMAP domain doesn't have.
>
> Instead, use the hwirq_max field which has the correct semantics, and
> keep revmap_size to 0 for a NOMAP domain.
> </commit>
>
> If you agree with this, please say so (no need to respin for this).

Yes, I agree.

Thanks,

                Xu.

>
> Thanks,
>
> 	M.
>